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General| Category | Desktop |
|---|---|
| Manufacturer | Digital Equipment Corporation (DEC) |
| Model | VT220 |
| Introduced | 1983 |
| Display Type | CRT |
| Screen Size | 12 inches |
| Communication Interface | RS-232 |
| Communication Protocol | Asynchronous |
| Emulation | VT100, VT52 |
| Text Attributes | Bold, Underline, Reverse |
| Keyboard | Detachable |
| Baud Rate | 50 to 19200 bps |
| Power Supply | 100-240V, 50/60Hz |
Provides an overview of the manual's purpose and scope.
Details the structure and content of the manual's chapters.
Provides a general overview of the VT220 Series terminal.
Describes the physical components of the VT220 terminal.
Provides an overview of the terminal's controls, indicators, and connectors.
Details the controls, indicators, and connectors of the monitor assembly.
Provides an overview of system interactions during terminal operating states.
Describes the terminal functions in Set-Up, Local, and On-Line operating states.
Explains functions performed from the keyboard in Set-Up mode.
Defines the functions and components of the CPU logic.
Identifies the major circuits and components of the Central Processing Unit (CPU).
Overview of system communication logic interfaces with peripherals and hosts.
Identifies the five major circuits comprising the system communication logic.
Explains the function of video logic in driving monitor circuits and CRT.
Lists the major components and circuits of the video logic.
Introduces the LK201 keyboard as the user's interface to the terminal.
Describes the physical layout and components of the LK201 keyboard.
Provides a functional description of the LK201 keyboard's operations.
Provides a detailed description of the keyboard circuit's operation.
Covers keyboard functions controlled by the system central processor.
Provides detailed specifications for the keyboard's functional and physical aspects.
Explains the role of monitor circuits and CRT in displaying output.
Lists the major components and circuits of the monitor assembly.
Details the video amplifier circuit's function in converting video input.
Explains the horizontal deflection circuit's role in beam movement.
Describes the flyback transformer circuit's high voltage outputs.
Explains the vertical deflection circuit's role in beam movement.
Explains the dynamic focus circuit's role in optimizing focus in screen corners.
Describes the brightness control circuit for CRT display adjustment.
Explains the CRT device's function in providing actual output to the operator.
Identifies logic board components and schematic pages for monitor circuits.
Explains the power supply's function in converting AC input to DC voltages.
Lists the major circuits and components of the power supply.
Details the AC input components, including voltage selection and filtering.
Describes the AC conversion circuits providing DC voltage outputs.
Describes the DC OK circuit providing visual indication of DC presence.
Details the DC input components for filtering and outputting potentials.
Lists the general specifications of the VT220 terminal.
Details the physical dimensions and weight of the terminal and keyboard.
Outlines environmental operating and storage conditions.
Specifies storage temperature, humidity, and altitude limits.
Details electrical specifications including line voltage, frequency, and power.
Provides specifications for the CRT, active display size, format, and character sets.
Describes selectable video attributes like reverse video, underline, and blinking.
Specifies cursor display types: block or blinking underline.
Details general keyboard specifications, keypad layout, and key features.
Describes the sculptured key array and key spacing.
Describes audible feedback for keystrokes, bell, and multiple bell signals.
Categorizes areas of difference between VT102 and VT220 terminals.
Lists features and behaviors specific to the VT102 terminal.
Lists features and behaviors specific to the VT220 terminal.
Compares how VT102 and VT220 terminals respond to device attributes.
Illustrates the bit values for the 2681 DUART Mode Register 1.
Illustrates the bit values for the 2681 DUART Mode Register 2.
Illustrates the bit values for the 2681 DUART Status Register.
Illustrates the bit values for the 2681 DUART Data Clock Selection Register.
Illustrates the bit values for the 2681 DUART Command Register.
Illustrates bit values for the 9007 VPAC Characters Per Horizontal Period Register.
Illustrates bit values for the 9007 VPAC Characters Per Data Row Register.
Illustrates bit values for the 9007 VPAC Horizontal Sync Width Register.
Illustrates bit values for the 9007 VPAC Configuration/Skew Register.
Illustrates bit values for the 9007 VPAC Status Register.
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